William henry penrose



(No Model.)

W. H. PENROSE. SAW FILING MACHINE.

No. 424,724. Patented Apr. 1,1890.

l luulr N N, PETERS. Phntn-Lhhagraphw. Wanpingm 0. c.

UNITED STATES PATENT OFFICE,

XVILLIAM HENRY PENROSE, OF THE UNITED STATES ARMY.

r, SAW-FILING MACHINE.

SPECIFICATION forming part of Letters Patent No. 424,724, dated April 1,1890.

Application filed September 26, 1889. Serial No, 325,161. (No model.)

To all whom it may concern:

Be it known that 1, WILLIAM HENRY PEN- ROSE, of the United States Army,have invented certain new and useful Improvements in Saw-FilingMachines; and I do hereby declare that the following is a full, clear,and exact description thereof, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon, which form apart of this specification.

This invention relates to improvements in saw-filing machines, and moreparticularly to improvements in the machine of this class shown anddescribed in Letters Patent .of the United States No. 409,860, grantedto me the 27th day of August, 1889.

In the accompanying drawings, illustrating the present invention, Figurel is a perspective view of my improved device clamped upon a saw inposition for-use. Fig. 2 is a view looking lengthwise of the saw-clamp.Fig. 3 is a vertical section in the plane of the sawblade.

A represents a clamp for securing the device to the saw-blade,consisting of two jaws a a, united by a back a. The clamp A is removablysecured to the saw-blade by means of a set-screw A, threaded through oneof the jaws a, and arranged to bear against the sawblade or against aninterposed block of wood. Commonly the saw should bear directly againstthe jaw opposite that through which the set=screw passes. The back andupper parts of the jaws of the saw-clamp A are centrally cut away toallow the working of the file upon the saw-teeth, as shown at a? Uponthe back a, at one end of the clamp A, is fastened a platespring A. bymeans of a thumb-screw a the free end of said plate projecting into thegap 0, of the clamp, and being bent downward to engage a notch betweenadjacent teeth of a saw-blade and to bear into the bottom of said notch,where the clamp-back rests upon the points of the sawteeth. This devicewill be herein called a tooth-=gage.

B is a standard secured to the back of the clamp A at the opposite endthereof and rising in the plane of the saw-blade, This standard B isprovided with a lug 1) near its lower end, which projects over the gap ain the saw-clamp, and at its upper end is inclined in the'oppositedirection. To the upper extremity of this inclined portion 1) of thestandard is secured a plate-spring B, the free end of which projectsover the lug Z). Upon that side of the standard B from which projectsthe lug b and upon. the vertical portion of said standard is located anadjustable slide B adapted to be secured at variable elevation upon thestandard by means of a thumb screw This slide is called the stop-gage.

C is a yoke consisting of a vertical part 0, provided at its ends withlugs 0' 0 projecting at one side of the part c. The lower of these lugsc is provided with a pin 0 which projects through a closely-fitting holein the lug b of the standard, and is long enough to allow a limitedvertical motion of the yoke while retaining its position in the hole.The upper lug c is also provided with a pin 0, which projects throughthe end of the spring B, and, being screw-threaded, receives above saidspring a thumb -screw C. The pins 0 and c serve as vertical pivots onwhich the yoke C may swing laterally, and the thumbscrew C secures theyoke in any position to which it may have been turned. The vertical axisof the yoke is in the central. plane of the saw-blade. On the back sideof the yoke O the latter is provided with a shoul der or projection 0intended to strike the upper end of the stop-gage to limit the dept-h towhich the filing is to be done.

D is aplate, called theguide-plate,which is centrally pivoted to thevertical portion 0 of the yoke G on a clamp-screw d, which has its inthe vertical plane of the saw, and is provided at each of its fourcorners with a lug or thickened portion (1. Through these corner lugsare formed horizontal holes in the plane of the vertical axis of theyoke O, the holes in the upper lugs d of the guideplate being parallelwith those in the lower ones.

E is the fileframe, consisting of the end bars c c and parallel rods c cjoining the end bars. These rods are secured to one or the other of theend bars by set-screws, so as to allow the file frame to be lengthenedor shortened to adapt it for the insertion of files V release'thesaw-clamp and carry it to the heel of different lengths, substantiallyas set forth in my said former patent. The parallel rods 6 e of thefile-frame pass through the holes in the guide-plate I) and slidetherein in the reciprocating motions of said file-frame. The end bars 6e are provided with rotatable file-sockets D D at their lower ends toreceive the shank and point'of a three-cornered file, and one of thesesockets is held from rotation in its end bar by means of athumb-screw e.To insert a file, one of the end bars is loosened, which allows it to beslid outward, and after the file has been inserted itis forced inward ortoward the other sufficiently to cause the ends of the file to bind inthe sockets. The securing of one of said sockets against rotation by theset-screw (5 therefore prevents rotation of the file in use.

The spring 13 is intended in part to yieldingly support the yoke C andthe parts connected therewith, and it is contrived to normally sustainthe lowermost surface of the file clear'of the saw-teeth when the deviceis applied to the saw. It is, however, adapted to yield to moderatedownward pressure, so that in working the file-frame the file may bemade to enter the saw-blade as it does its work.

The device above described is to be manipulated as follows: Afterloosening the stopgage and tooth-gage, place the saw-clamp upon the sawwith the latter in contact with the back of the clamp. The guide-plate Dhaving been set to give the desired inclination to the file, and theyoke being set by the thumbscrew with reference to the pitch and bevelof the saw-teeth, bring the file down into a notch between teeth of thesaw, and then secure the clamp upon the saw-blade by means of theset-screw A, or any equivalent device that may be employed. This done,work the file to the proper depth, and while holding it in the bottom ofthe notch of the saw-blade just cut by it set the stop-gage in contactwith the shoulder a on the yoke C and set the tooth-gage with its freeend in the second notch from that occupied by the file. Now

of the saw, placing the file in the first notch to be deepened, or, inother words, back of the first tooth to be sharpened. Secure thesaw-clamp upon the saw and work the file till the shoulder c on the yokestrikes the stopgage, then loosen the saw-clamp and move it along farenough to bring the toothgage into the notch just filed, and fasten thesawclamp again to the saw. In this position of the saw-clamp the file isagain operated to deepen the third notch from the heel of the alternatenotch or tooth from heel to point of the saw-blade, the latter may bereversed end for end, and the intermediate notches maybe cut in orderfrom point to heel, completing the sharpening of all the teeth Withoutresetting the yoke C or the guide-plate D. If preferred, however, theyoke and guide-plate may be reset and the intermediate notchessuccessively cut from heel to point, as in the first run over the saw.

As the depth of the notches of a saw determines the number of teeth tothe inch,the standard B may be graduated on that face to which the stopgage is applied, so that the latter may be set in the first place togive a desired number of teeth to the inch.

While a vise will'be convenient for holding the saw while being filed,it is manifestly not necessary. The use of the device described mustplainly insure perfect uniformity in the size of the teeth throughoutthe whole length of the saw.

I claim as my invention- 1. The combination of asaW-clamp, a standardsecured thereto, a laterally-swinging and vertically movable yokesupported by the standard and having its vertical axis in the *plane ofthe space within the saw-clamp ocstandard, both the pivot of the guidefor the file-frame and the axis of the yoke being in the plane of thesaw.

3. The combination of a saw-clamp provided with a standard, alaterally-swinging and vertically-movable yoke supported by thestandard, a file-carrying frame, a verticallyswinging guide for thefile-frame pivoted to the yoke, and a stop limiting the downwardmovement of the yoke. I

4.. The combination of a saw-clamp provided with a standard, alaterally-swinging and vertically-movable yoke supported by thestandard, a file-carrying frame, a verticallyswinging guide for thefile-frame pivoted to the yoke, an adjustable stop mechanism forlimiting thedownward motion of the yoke,

and an adjustable tootl1gage.

a clamp-nut, adjustable stop-gage regulating the down motion of theyoke, and an adjustable spring tooth-gage attached to the sawclamp andprojecting over the gap thereof. saw. Proceeding in this way to fileeach In testimony that I claim the foregoing as my invention I affiX mysignature in presence of two witnesses.

l/VILLIAM HENRY PENROSE.

Witnesses:

FERGUS FERGUSON, OLEssoN S. KINNEY.

IIO

